Check engine light on and battery keeps dying. Bad battery or Alternator?

Asked by Nov 17, 2016 at 08:19 AM about the 2010 Dodge Ram 2500 SLT Mega Cab 4WD

Question type: Maintenance & Repair

1 Answer

100,265

It could be one the other or both, Charge the battery if you can, after the charge check to see if you have 12 Volts and then start the car and let it run for about 1/2 Hour. Stop the car and check the volts on the battery if it not 12 Volts then the Alternator is not charging and draining the battery

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